Malicious PDF — malware analysis report

Static analysis result for SHA-256 047dea24a29d2d89…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 13:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3224412f4aa1a604000d8f143675953e SHA-1: 6ac9440e6b09077f348ae34ac794489f4d044d4a SHA-256: 047dea24a29d2d89732af4df18bdd9e9ce95e7cbe66a147720ce0fc58767c57d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm hosted on compromised CMS uploads and disposable hosting, aiming to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://epmachine.ru/d/files/57614650215.pdf In PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/bojiwizavijeb.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/gomexanitatikoxa.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/rugakagu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161337c53d38cb---jinezagapunato.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be7d1b9ba---55137063826.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613696d5a53d4---60825521483.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/paguwumimaxul.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/mogurupufelidemekegop.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/13330709841.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad4f26d71---20852253933.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bcd119ab---78259960657.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/14404389824.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/julasajamowukewe.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/kogigak.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/667936493.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/6364710955.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/50897662543.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/6744391020.pdfIn PDF document text
    • http://wohingltd.com/userfiles/migunozoxavisib.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/41297407891.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/wubewamixafegi.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/juwagit.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/90677705980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vector+full+mod+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 10768 bytes
SHA-256: aa3765800461a4972f23d1bbb17ef56def0a9bb28f1f40322f4e32fcff26af78
font_02_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 17708 bytes
SHA-256: f03824eacc811936805e8dcac8865609f27b9762182d8cc63a0988f5e6af9684

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